[PATCH][GCC] Fix oversized shifts in PR/88903 testcase.

[Tamar Christina]

Hi All,

The testcase for PR/tree-optimization 88903 hits
undefined behavior for the overwide shifts.  This is
causing the testcases to fail for all Arm platforms.

This updates the testcase to add an explicit & such
that the behavior is consistent.

Regtested on aarch64-none-linux-gnu and no issues.

Ok for trunk?

Thanks,
Tamar

gcc/testsuite/ChangeLog:

2019-01-21  Tamar Christina  <tamar.christina@arm.com>

	PR/tree-optimization 88903
	* gcc.dg/vect/pr88903-1.c: Add explicit &.

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